Yaswanth Mangalagiri

  G o o g l e ! Bug : Circumventing "Limit to 1 response" of  Google forms  ( Parameter Injection )        Discovered on: 30th, November 2016.            Research Time: 2:00 p.m to 9:30 p.m. Earn more by display ads on blog with  Lithific Ads The setting is "Limit to 1 response" which means only one response per user. Once you filled the form there will be no chance to edit the responses or again fill a new form. If you open the form to fill again, the response would be like the image below. There is no way to edit or fill another form (Hurdle 1). I created a test form and checked "Edit after submit". Once this test form is filled I can change the previous response.  I clicked on the "Edit your  response"and intercepted the request.  I changed the form id and forwarded the request. I was able to see the form that was submitted. When I edited the form and submitted, a blank form was sent. (Hurdle 2). I analysed the requests f